<template>
  <div class="edit-popup">
    <van-cell title="我的频道">
      <van-button
        size="small"
        round
        class="edit-btn"
        @click="isEdit = !isEdit"
        >{{ isEdit ? '完成' : '编辑' }}</van-button
      >
    </van-cell>
    <div class="my-pannel">
      <van-grid :border="false">
        <van-grid-item
          :text="item.name"
          v-for="(item, index) in myChannels"
          :key="item.id"
          :class="{ active: constantChannels.includes(item.name) }"
          @click="onMyChannel(item, index)"
        >
          <!-- includes: 
        constantChannels里是否有item.name
        有返回true  没有返回false
         -->
          <template
            #icon
            v-if="isEdit && !constantChannels.includes(item.name)"
          >
            <van-icon name="cross" />
          </template>
        </van-grid-item>
      </van-grid>
    </div>
    <van-cell title="推荐频道" />
    <div class="recommend-pannel">
      <van-grid>
        <van-grid-item
          :text="item.name"
          v-for="item in recommendChannels"
          :key="item.id"
          @click="$emit('add-channel', item)"
        >
          <template #icon>
            <van-icon name="plus" />
          </template>
        </van-grid-item>
      </van-grid>
    </div>
  </div>
</template>
<script>
import { getAllChannelsAPI } from '@/api'
export default {
  props: {
    myChannels: {
      type: Array,
      // default: () => []
      required: true
    }
  },
  created() {
    this.getAllChannels()
  },
  computed: {
    recommendChannels() {
      const isIncludeInMychannels = (id) =>
        !!this.myChannels.find((item) => item.id === id)

      return this.allChannels.filter((item) => {
        return !isIncludeInMychannels(item.id)
      })
    }
  },
  data() {
    return {
      //是否处于编辑状态
      isEdit: false,
      constantChannels: ['推荐'],
      allChannels: []
    }
  },
  methods: {
    async getAllChannels() {
      const { data } = await getAllChannelsAPI()
      this.allChannels = data.data.channels
    },
    onMyChannel({ id, name }, index) {
      if (this.isEdit) {
        if (!this.constantChannels.includes(name)) {
          this.$emit('delete-channel', id)
        }
      } else {
        this.$emit('update-active', index)
      }
    }
  }
}
</script>
<style scoped lang="less">
.edit-popup {
  padding-top: 1.33333rem;
}
.edit-btn {
  border-color: red;
  color: red;
  width: 1.38667rem;
  height: 0.64rem;
}
:deep(.van-grid-item__content) {
  width: 175px;
  height: 86px;
  margin: 0 auto 10px;
  background-color: #f4f5f6;
}
.my-pannel {
  // 编辑按钮
  .editBtn {
    width: 104px;
    height: 48px;
    border-color: red;
    color: red;
  }

  // 编辑按钮居中
  .van-cell__value {
    display: flex;
    justify-content: flex-end;
    align-items: center;
  }

  // 关闭按钮样式
  :deep(.van-grid-item__content) {
    position: relative;

    .van-grid-item__icon-wrapper {
      position: absolute;
      top: 0;
      right: 0;

      .van-icon-cross {
        position: absolute;
        top: 0;
        right: 0;
        transform: translate(20%, -35%);
        border: 0.02667rem solid #000;
        border-radius: 50%;
        text-align: center;
        line-height: 0.32rem;
        font-size: 14px;
      }
    }
  }
}
// 推荐频道
.recommend-pannel {
  // 推荐频道加号样式
  :deep(.van-grid-item__content) {
    flex-direction: row;

    .van-grid-item__icon-wrapper {
      font-size: 0.5rem;
    }
  }
}
.active {
  :deep(.van-grid-item__text) {
    color: red;
  }
}
</style>
